High-redshift objects and the generalized Chaplygin gas

Details High-redshift objects and the generalized Chaplygin gas High-redshift objects and the generalized Chaplygin gas

2002-10-21

arxiv.org/abs/astro-ph/0210476v2

Phys.Rev.D67:043514,2003

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.043514

Motivated by recent developments in particle physics and cosmology, there has been growing interest in an unified description of dark matter and dark energy scenarios. In this paper we explore observational constraints from age estimates of high-$z$ objects on cosmological models dominated by an exotic fluid with equation of state $p = -A/\rho^{\alpha}$ (the so-called generalized Chaplygin gas) which has the interesting feature of interpolating between non-relativistic matter and negative-pressure dark energy regimes. As a general result we find that, if the age estimates of these objects are correct, they impose very restrictive limits on some of these scenarios.

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